Camellia leaves appear red and black spots. Anthrax or Starscream? How to solve it?

The red spots and black spots on camellia leaves are plant diseases, not red spiders. Judging from the pictures provided by the subject, it should be anthrax and bituminous coal disease, with traces of drug spots on them. It is estimated that there is not much effect after treatment. Below I will combine my experience in raising camellia to solve this problem.

First, the cause of camellia anthracnose (erythema):

1. Generally the room temperature is between 25℃ and 28℃. If it rains continuously, careless watering leads to excessive watering, which is easy to cause anthrax.

2. It usually happens in rainy season or spring with continuous rainfall.

Second, the solution after anthrax:

1, pay attention to adjust the room temperature to ensure ventilation.

2. Cut off yellow leaves, diseased leaves and dead branches in time.

3. Before preventing the onset, you can spray Bordeaux solution or carbendazim for prevention and treatment.

4. Be careful not to water too much at ordinary times, and keep the soil dry before watering properly. In addition, potassium dihydrogen phosphate can be properly added to promote flower bud differentiation and leaf regeneration.

Third, the causes of camellia bituminous coal disease (black spot):

1, affected by climate and rainy days.

2, the pruning is not timely, the whole plant is transparent, and the lighting is poor.

3. Secretions left by some pests as pathogens provide nutrients for the spread of bacteria.

Four, camellia bituminous coal disease solution:

1, properly prune, reduce the cleaning of diseased branches and leaves, and strengthen the light transmission and lighting of the whole plant.

2. At the early stage of the disease, thiophanate methyl wettable powder, chlorothalonil wettable powder, kocide wettable powder and 0.3% ~ 0.5% Bordeaux mixture can be used for prevention and control. Take the medicine twice a day, and spray it every 10 day/time. Wipe out bituminous coal disease and anthracnose completely in the cradle.

Considering the above two camellia diseases and the most economical cost, I suggest that the subjects use Bordeaux mixture for comprehensive control. One medicine can cure two diseases, but later management should also be strengthened, especially pruning this piece.

The above are my suggestions on anthracnose and bituminous coal disease of camellia oleifera, I hope it will help you. For more maintenance questions, you can leave a message in the comment area and discuss it together.